Crustal structure of the Nova Scotia margin and implications for the Moroccan margin conjugate

Details Crustal structure of the Nova Scotia margin and implications for the Moroccan margin conjugate Crustal structure of the Nova Scotia margin and implications for the Moroccan margin conjugate

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6717w&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6717

Physics

Scientific paper

The Nova Scotia margin is located at a transition from volcanic margins in the south to non-volcanic margins in the north along the Eastern Atlantic continental margin system. South of the Nova Scotia margin, seaward dipping reflections (SDR) and a high-velocity lower crustal layer are observed across the ocean-continent transition (OCT), indicative of volcanic margins. North of the Nova Scotia margin, no SDR is observed and thin crust overlies serpentinized mantle across the OCT. Along the Nova Scotia margin, an SDR sequence is observed but only on the southern-most part neighboring Georges Bank. The East Coast Magnetic Anomaly, possibly related to an igneous wedge, extends further to the north but disappears south of the Scotian Basin. In order to understand the crustal structure of this transition from volcanic to non-volcanic margin, three wide-angle seismic reflection/refraction (WAR/R) profiles were acquired across the full width of the Nova Scotia margin in 2001, to delineate the crustal features from continental crust to oceanic crust. The northern profile (Line 1) crosses the Scotian Basin and coincides with existing multi-channel seismic reflection (MCS) profile 89-1; the middle profile (Line 2) crosses the Lahave Platform and coincides with MCS profiles 88-1 and 88-1a; and the southern profile (Line 3) crosses the southwestern part of the margin. Preliminary results for the middle WAR/R profile indicate that serpentinized mantle is observed below the OCT, possibly overlain by thin oceanic crust. Oceanic crust is about 6 km thick, 1-2 km thicker than that of the northern profile. This indicates increasing volcanism and magma generation from the northern to the southern parts of the margin. WAR/R profiles were collected across the conjugate NW-Moroccan margin in 2001, one of which is 60 km to the north of Line 1 in the plate reconstruction at the time of rifting. Similar amounts of crustal extension and widths of transitional crust are shown along these two conjugate WAR/R profiles. No WAR/R profiles are available in conjugate positions to the Nova Scotia margin lines 2 and 3. However, by analogy to Line 1, we suggest that the Moroccan margin will also be characterized by increasing volcanism toward the south.

Affiliated with

Also associated with

No associations

Rating

Crustal structure of the Nova Scotia margin and implications for the Moroccan margin conjugate does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Crustal structure of the Nova Scotia margin and implications for the Moroccan margin conjugate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crustal structure of the Nova Scotia margin and implications for the Moroccan margin conjugate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-843526